Spectroscopic properties of nearby late-type stars, members of stellar kinematic groups

TL;DR

This study aims to accurately identify members of stellar moving groups among nearby late-type stars using high-resolution spectra to analyze their kinematics and age-related properties, addressing challenges in group membership determination.

Contribution

It introduces a method combining high-resolution spectroscopy and multiple age indicators to improve moving group membership identification.

Findings

Refined list of unambiguous moving group members.

Comparison of age estimators for young late-type stars.

Insights into the kinematic and age properties of nearby stars.

Abstract

Nearby late-type stars are excellent targets to look for young objects in stellar associations and moving groups. The study of these groups goes back more than one century ago however, their origin is still misunderstood. Although their existence have been confirmed by statistical studies of large sample of stars, the identification of a group of stars as member of moving groups, is not an easy task, list of members often change with time and most members have been identified by means of kinematics criteria which is not sufficient since many old stars can share the same spatial motion of those stars in moving groups. In this contribution we attempt to identify unambiguous moving groups members, among a sample of nearby-late type stars. High resolution echelle spectra is used to i) derive accurate radial velocities which allow us to study the stars' kinematics and make a first selection of moving groups members; and ii) analyze several age-related properties for young late-type stars (i.e., lithium LiI 6707.8 Amstrongs, R'HK index). The different age-estimators are compared and the moving group membership of the kinematically selected candidates are discussed.